Anode-free all-solid-state batteries(AFASSBs),composed of a fully lithiated cathode and a bare current collector(CC)that eliminates excess lithium,can maximize the energy density(because of a compact cell configuration)and improve the safety of solid-state systems.Although significant progress has been made by modifying CCs in liquid-based anode-free batteries,the role of CCs and the mechanism of Li for-mation on CCs in AFASSBs are still unexplored.Here,we systematically investigate the effect of the sur-face roughness of the CCs on the Li plating/stripping behavior in AFASSBs.The results show that the moderately roughened CC substantially improves the Coulombic efficiency and cycle stability of AFASSBs owing to the increased contact points between the solid electrolyte and the roughened CC.In contrast,the excessively roughened CC deteriorates the performance owing to the contact loss.Moreover,an ex situ interface analysis reveals that the roughened surface of the CC could suppress the interfacial degradation during the Li ion extraction from a sulfide solid electrolyte to a CC.This provides an indication to the origin that hinders the electrochemical performance of AFASSBs.These findings show the potential for the application of surface-engineered CCs in AFASSBs and provide guidelines for design-ing advanced CCs.

Donghee Gu;Hyoungchul Kim;Jong-Ho Lee;Sangbaek Park

Energy Materials Research Center,Korea Institute of Science and Technology(KIST),Seoul 02792,Republic of Korea;School of Civil,Environmental and Architectural Engineering,Korea University,Seoul 02841,Republic of Korea;Division of Nanoscience and Technology,University of Science and Technology(UST),Seoul 02792,Republic of Korea;Department of Materials Science and Engineering,Chungnam National University,Daejeon 34134,Republic of Korea

能源化学

[1]Donghee Gu;Hyoungchul Kim;Jong-Ho Lee;Sangbaek Park-.Surface-roughened current collectors for anode-free all-solid-state batteries)[J].能源化学,2022(07):248-257

AFASSBs

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